:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-bg: rgba(37, 99, 235, 0.06);
  --success: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #d97706;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 0;
  --topbar-h: 42px;
}

* { box-sizing: border-box; margin: 0; }

body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--border);
  font-size: 14px;
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}

/* ── Topbar ─────────────────────────────────────── */

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--topbar-h);
  padding: 0 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.title {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

.status {
  font-size: 12px;
  color: var(--text-3);
}

/* ── Grid Layout ────────────────────────────────── */

.grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1px;
  height: calc(100vh - var(--topbar-h));
}

.panel.top-left  { grid-column: 1; grid-row: 1; }
.panel.top-right { grid-column: 2; grid-row: 1; }

.panel.bottom {
  grid-column: 1 / -1;
  grid-row: 2;
  min-height: 0;
}

.panel {
  background: var(--surface);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

/* ── Panel Header ───────────────────────────────── */

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 12px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

h2, h3 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Buttons ────────────────────────────────────── */

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 4px 10px;
  border: none;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--accent);
  color: #fff;
  white-space: nowrap;
}

button:hover { background: var(--accent-hover); }

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}

button.secondary:hover {
  background: var(--bg);
  border-color: var(--text-3);
}

button.danger {
  background: var(--danger);
  color: #fff;
}

button.danger:hover { background: var(--danger-hover); }

/* ── Source List ─────────────────────────────────── */

.list {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex: 1 1 auto;
  min-height: 0;
  padding: 6px;
  gap: 4px;
}

.list-item {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.list-item:hover {
  background: var(--accent-bg);
  border-color: rgba(37, 99, 235, 0.2);
}

.list-item.selected {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.list-item .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

.list-item button {
  padding: 2px 8px;
  font-size: 11px;
}

.muted {
  color: var(--text-3);
  font-size: 12px;
}

/* ── Badges ──────────────────────────────────────── */

.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 0;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
}

.badge.offline { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

.badge.quality-good      { background: rgba(5, 150, 105, 0.1);  color: var(--success); }
.badge.quality-bad       { background: rgba(239, 68, 68, 0.1);  color: #dc2626; }
.badge.quality-uncertain { background: rgba(217, 119, 6, 0.1);  color: var(--warning); }
.badge.quality-unknown   { background: rgba(148, 163, 184, 0.12); color: #64748b; }

/* ── Data Table (Points) ─────────────────────────── */

.table-wrap {
  flex: 1 1 auto;
  overflow: auto;
  min-height: 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  table-layout: fixed;
}

.data-table thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table th {
  background: var(--surface-2);
  text-align: left;
  padding: 5px 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 4px 12px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.data-table tbody tr {
  transition: background 0.1s;
}

.data-table tbody tr:hover {
  background: var(--accent-bg);
}

.point-name {
  font-weight: 500;
  color: var(--text);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.point-id {
  font-size: 11px;
  color: var(--text-3);
  font-family: "JetBrains Mono", "Consolas", monospace;
}

.point-value {
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
}

.empty-state {
  text-align: center;
  color: var(--text-3);
  padding: 32px 12px !important;
  font-size: 13px;
}

/* ── Pager ────────────────────────────────────────── */

.pager {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 12px;
  color: var(--text-3);
}

.pager button {
  width: 22px;
  height: 22px;
  padding: 0;
  font-size: 16px;
  line-height: 1;
}

/* ── Toolbar ──────────────────────────────────────── */

.toolbar {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

/* ── Form ─────────────────────────────────────────── */

.form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--text-2);
}

.form input[type="text"],
.form input[type="url"],
.form input[type="password"],
.form input[type="number"],
.form input:not([type]) {
  padding: 7px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  transition: border-color 0.15s;
}

.form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12);
}

.check-row {
  flex-direction: row !important;
  align-items: center;
  gap: 6px;
}

.form-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding-top: 4px;
}

/* ── Tree ─────────────────────────────────────────── */

.tree {
  overflow-y: auto;
  padding: 4px 8px;
  flex: 1 1 auto;
  min-height: 0;
}

.tree details { margin-left: 12px; }

.tree summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0;
  font-size: 13px;
}

.tree summary.has-children::before {
  content: "▸";
  color: var(--text-3);
  font-size: 10px;
}

.tree details[open] > summary.has-children::before {
  content: "▾";
}

.tree summary::-webkit-details-marker { display: none; }

.tree .node-label { color: var(--text); }

/* ── Log ──────────────────────────────────────────── */

.log {
  background: #0f172a;
  padding: 6px 10px;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 12px;
  line-height: 1.55;
  color: #cbd5e1;
  overflow-y: auto;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 0;
}

.log-line {
  white-space: pre-wrap;
  word-break: break-word;
  padding: 0 4px;
  border-radius: 0;
}

.log-line:hover { background: rgba(255, 255, 255, 0.04); }

.log-line .level {
  font-weight: 700;
  margin-right: 6px;
  font-size: 11px;
}

.log-line .message { margin-left: 6px; }
.log-line .muted   { margin-left: 4px; color: #64748b; }

.log-line.level-trace .level { color: #64748b; }
.log-line.level-debug .level { color: #38bdf8; }
.log-line.level-info  .level { color: #34d399; }
.log-line.level-warn  .level { color: #fbbf24; }
.log-line.level-error .level { color: #f87171; }

/* ── Modal ────────────────────────────────────────── */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  backdrop-filter: blur(2px);
}

.modal.hidden { display: none; }

.modal-content {
  width: min(860px, 94vw);
  max-height: 85vh;
  overflow: hidden;
  background: var(--surface);
  border-radius: 0;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
}

.modal-content.modal-sm {
  width: min(420px, 94vw);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-head h3 {
  font-size: 15px;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
}

.modal-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-content .tree {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  background: var(--surface-2);
  max-height: 50vh;
}

/* ── Scrollbar ────────────────────────────────────── */

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ── Responsive ───────────────────────────────────── */

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
    height: auto;
  }
  body { height: auto; overflow: auto; }
  .panel.top-left  { min-height: 200px; }
  .panel.top-right { min-height: 300px; }
  .panel.bottom    { max-height: none; min-height: 200px; }
}